Improvement in watch-regulators



L. O. BRIGGS. Watch-Regulator.

No. 206,533. Patented July 30,1878.-

UNITED STATES PATENT OFFICE.

.IJEONARD O. BRIGGS, OF BOSTON, MASSACHUSETTS.

IMPROVEMENT IN WATCH-REGULATORS.

Specification forming part of Letters Patent No. 206,533, dated July 30,1878; application filed April 1, 1878.

To all whom "it may concern:

Be it known that I, LEONARD O. Bnrees, of Boston, in the county ofSuffolk and State of Massachusetts, have invented certain new and usefulImprovements in WVa-tch-Regulators, of which the following is aspecification:

The object of my invention is to provide a watch-regulator with means ofaccurate or nice adjustment, which shall be less liable to becomedefective by use, and shall not be affected by changes of temperature,as is the case with those heretofore constructed for the purpose,wherein are used long springs or extended set-screws, liable to expandand contract, so as to cause the watches to which they are attached togain or lose time as their temperature varies. These and otherobjections are obviated by my invention 5 and it consists, first, inproviding the end or index-point of the regulator with a round end,forming about two-thirds of a circle; and, further, in the construction,combination, and arrangement of a notched plate or bar, so as to receivein one of said notches this round end or indexpoint of the regulator,the plate or bar being secured to the balance-wheel arm or bridge by ascrew or screws passing through an oblong slot in such bar, in suchmanner as to be adjnsted in a straight line by means of anadjusting-screw, which has a groove near its head, into which is placeda vertical or downward projecting bifurcated end of the said plate orbar, as hereinafter more fully described and set forth.

Figure 1 is a perspective view, showing my invention as attached. Fig. 2is a section View of Fig. 1, as shown-by dotted line. Fig. 3 is a viewof the separate detached parts.

A represents the arm, to which the balance-wheel is journaled at itstop, and to which the regulator B is pivoted in the usual manner. Erepresents the notched bar, having aseries of notches, 1?, upon itsedge, into one of which the rounded end L of the regir lator is placed,the bar E being provided with a slot, S, about midway on its horizontalbody, through which a screw is passed, so as to permit it to be slidback and forth upon or beneath the flat head of the screw which securesit in position on the top of the arm A. This bar E is provided with abifurcated or forked end, T, which is bent downward, so as to stand at aright angle to the top or notched body portion E, as shown in Fig. 2,and embraces the body of the adjusting-screw H near its head, where itis provided with a groove, F, to receive the ends T, one passing eachside of the screw H, which fits into a screwthreaded hole inside of thearm A, its head being provided with the usual slot and several notches Varound the edge or periphery of same, so as to permit of being screwedout or in by any small instrument placed therein, by which means the barE may be moved very slightly in either direction, so as to adjust theregulator B, whose opposite end is provided with projecting pins, whichpass each side of the hair-spring con nected with the balance-wheel, asheretofore, so as to increase or diminish the force of the spring, asusual, and thus regulate the running of the watch or chronometer, asdesired.

The several notches P in the bar E are to permit the regulator end L tobe placed in such notch as may be required, in order to move theregulator B the distance, in either direction, desired, and may bechanged from one notch to another, whenever required, by removing thescrew from slot S in the bar E, so as to permit its removal andreadjustment.

The bar E may be curved upon its notched edge.

I am aware that a notched segmental plate moved concentric with the axisof the index by means of a set-screw has heretofore been employed forthe purpose 5 therefore I do not claim such.

Having thus described my invention, I claim- In combination with theregulator B, having a rounded end, the adjustable straight bar E, havingthe notches P, slot S, and bifurcated end T, embracing the adj usting-screw H, han'ng groove F and notches V, substantially as and for thepurposes set forth.

LEONARD O. BRIGGS. lVitn esses:

SYLvENUs WALKER, HORATIO NELsoN.

